class Point {
	int x ,y;
	void setXY(int m,int n) {
		x=m;
		y=n;
	}
}
public class Example4_4 {
	public static void main(String args[]) {
		Point p1,p2;
		p1 = new Point();
		p2 = new Point();
		System.out.println("p1的引用:"+p1);
		System.out.println("p2的引用:"+p2);
		p1.setXY(1111,2222);
		p2.setXY(-100,-200);
		System.out.println("p1的x,y坐标:"+p1.x+","+p1.x);
		System.out.println("p2的x,y坐标:"+p2.x+","+p2.y);
		p1 = p2;
		System.out.println("将p2的引用赋给p1后:");
		System.out.println("p1的引用:"+p1);
		System.out.println("p2的引用:"+p2);
                System.out.println("p1的x,y坐标:"+p1.x+","+p1.y);
		System.out.println("p2的x,y坐标:"+p2.x+","+p2.y);

	}
}

